EP0341127A2 - Verfahren und Vorrichtung zum Hochfrequenzgiessen vom flüssigen Kunststoff - Google Patents

Verfahren und Vorrichtung zum Hochfrequenzgiessen vom flüssigen Kunststoff Download PDF

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Publication number
EP0341127A2
EP0341127A2 EP89401162A EP89401162A EP0341127A2 EP 0341127 A2 EP0341127 A2 EP 0341127A2 EP 89401162 A EP89401162 A EP 89401162A EP 89401162 A EP89401162 A EP 89401162A EP 0341127 A2 EP0341127 A2 EP 0341127A2
Authority
EP
European Patent Office
Prior art keywords
mold
nozzle
injection
high frequency
plastic material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89401162A
Other languages
English (en)
French (fr)
Other versions
EP0341127A3 (de
Inventor
Robert Oriez
Elie Gras
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anver SA
Original Assignee
Anver SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anver SA filed Critical Anver SA
Publication of EP0341127A2 publication Critical patent/EP0341127A2/de
Publication of EP0341127A3 publication Critical patent/EP0341127A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/812—Venting

Definitions

  • the invention relates to a method and an apparatus for high frequency molding of liquid plastic.
  • an object of the invention to provide a method and an apparatus which find application for the overmolding using a wide variety of plastic parts, for example wood, glass, laminated composite material and, where appropriate, metal.
  • an object of the invention to provide a method and an apparatus which allow the production of overmolded parts of the most diverse shapes, in particular of the closed contour type.
  • a method according to the invention of high frequency molding by injection under pressure of liquid plastic material into a mold with, if necessary, simultaneously with said injection placing under vacuum of the cavity inside the mold, is characterized in that for molding on a prisoner and / or the overmolding of a shaped part with a closed contour, there is a sealing insert between the outlets in the mold of the injection nozzle and of the venting nozzle the shape corresponds to the profile of the mold and which is made of a material of the same nature as that of the plastic material injected so that it is melted and welded to the molded part or overmolded during the application of the high frequency electric field by a suitable generator.
  • the method can advantageously be implemented with a plastisol, that is to say a suspension or emulsion of PVC resin, without however being limited to such a product, the invention finding on the contrary application for the molding of very many materials.
  • liquid plastics especially those of the polyurethane or polyether type.
  • the high-frequency liquid plastic molding apparatus comprising a nozzle for injection into a mold of pressurized plastic material and a nozzle for connecting the cavity of said mold to the atmosphere or to a source of vacuum , with a device for double-acting cylinders for controlling the opening and closing of said nozzles is characterized in that said device forms a unitary assembly suitable for being associated removably to each mold which it equips and in which the pistons and the parts which are associated therewith of the jacks are made of a material which does not exhibit dielectric loss.
  • the actuator device is thus insensitive to the electric field with the consequence of a safe and risk-free operation of the device, in particular during the application of the high frequency electric field.
  • FIG. 1 illustrates, very schematically, the operation of a high-frequency molding apparatus for liquid plastic.
  • the device essentially consists of a first part 10 for supplying liquid plastic, for example a plastisol, to a mold 11 which, after filling, is brought in line with a high frequency electric generator 12.
  • a high frequency electric generator 12 This the latter is generally fixed while the parts 10 and 11 are movable, the first when the mold 11 is moving closer and apart as shown by the double arrow F, and the second when the generator 12 is moved closer and apart, as shown by the doubles arrows G and H.
  • the supply portion 10 comprises a nozzle for injecting liquid plastic material 15 and a nozzle 16 suitable for being connected to the atmosphere or to a source of vacuum via '' a pot or settling tank.
  • the nozzles 15 and 16 of the supply part 10 are adapted to cooperate conjugate end pieces 17 and 18, respectively, of the mold part 11 when, said part being stationary, the part 10 is brought closer to said mold.
  • the supply part 10 is moved away from the mold and the latter by a displacement along the arrows G and H brought into the electric field generator 12.
  • the mold is removed from the generator, opened, the part formed removed and after the mold has been returned to its initial position, the appliance is in condition for the execution of a new cycle.
  • a suitable programmer or automaton controls the succession of the operations which have just been described.
  • the invention provides, as shown in FIGS. 2 and 3, to assemble in a unitary device the nozzle 17 for injecting plastic material liquid and the nozzle 18 for connection to the vacuum source, as well as the control means of said nozzles, said unitary device being adapted to be removably associated with each mold which it equips.
  • the nozzle 17 (and the same applies to the nozzle 18 not shown) is a male nozzle mounted in a block 20 suitable for being fixed by removably on the mold 21 proper by means such as bolts 22, shown schematically in FIG. 4.
  • the invention provides for mounting in the block 20 two double-acting cylinders associated respectively with each of the nozzles, that associated with the nozzle 17 being shown in FIG. 2 where it is designated by the overall reference 30.
  • a jack comprises a piston 31 mounted to slide in a cylinder 32 and a piston rod 33 mounted for sealing by an O-ring 34 in an orifice passage of the bottom 35 of the cylinder 32, which is further closed at its opposite end by a plate 36.
  • the piston 31 and the rod 33 associated with it are made of a material which does not exhibit dielectric loss, and which is therefore insensitive to the high frequency electric field, an example of such a material being a polytetrafluoroethylene or a similar material, of the type of those known under the brand TEFLON (a Trademark of the company Du Pont de Nemours).
  • pneumatic means are preferably provided, comprising a first pipe 42 opening through a conduit 43 drilled in the block 20 in the first chamber formed between the cover 36 and the piston 31, while a second pipe 44 opens by a borehole 45 formed in the same block 20 in the other cylinder chamber limited between the piston 31 and the bottom 35 of the cylinder 32.
  • the pipes 42 and 44 are suitable for being connected with the corresponding pipes 46 and 47, respectively, carried by a movable carriage 50 mounted to slide on rails 51 fixed on a base 52 of the device. As shown in FIG.
  • the carriage 50 spreads the nozzles or female nozzles 15 and 16 intended to cooperate with the nozzles 17 and 18, respectively, the nozzle 15 being connected to a pipe for introducing the liquid plastic material 55, while the nozzle 16 is connected to a source of vacuum by a pot or not shown settling tank.
  • each of the nozzles 15 and 16 is equipped with a valve as shown in 56 for the end piece 15, and which is most simply constituted by a cylinder mounted to slide in the end piece under the action of a jack 57 with an end head 58 suitable for cooperating with the ball 23, as shown in FIG. 3 .
  • the operation of this device results immediately from the above. Since the liquid plastic material to be injected is kept under permanent pressure, either using a pump or using a jar, the head part 10 of the device is first brought closer to the mold, for example using a jack like 60, Figure 2, mounted on the base 52 and whose rod 61 is connected to a block 62 of said head.
  • the pneumatic means corresponding to the tip 16 and to the nozzle 18 are made operational so that the vacuum source, for example a pot or settling tank, exerts its action while the double-acting cylinder associated with the plastisol injection pipe 55 is in its condition which prohibits this injection into the mold 21.
  • the double-acting cylinder authorizing the injection of plastisol is made operative to release the rod 33 of the piston from the opening 40 of the counter-mold 41.
  • the plastisol is injected at ambient temperature by a circuit which comprises, from the pipe 55, the valve 56 then open, as shown in FIG. 3-, the nozzle 17, a chamber 65 formed under the bottom 35 of the block 20 and adjacent to the opening 40, said opening, then the cavity C until completely filling the latter, the excess plastic being collected, if necessary, in the pot or settling tank from from which said plastic material can then be recycled.
  • the double-acting cylinder 30 is actuated to close the orifice 40 of the counter-mold, which at the same time eliminates the molding core, and the nozzle 18 having meanwhile been disconnected from the vacuum source , the jack 57 is actuated to close the valves like 56 of the nozzles 15 and 16; after actuating the jack 60, the head 10 is moved away from the mold device 11. The latter can then, as indicated above, and by a displacement in the direction of the double arrows G and H be brought into the high frequency generator 12 where the polymerization of the injected plastic is carried out.
  • An apparatus according to the invention is also of interesting application for the implementation of a molding process on a prisoner or overmolding of a shaped part with a closed contour.
  • the invention provides to have between the outlets in the mold 21 of the injection nozzle 17 and the vacuuming nozzle 18, in the mold 21, an insert i , Figure 4, whose shape corresponds to the profile of the mold and which is made of a material of the same nature as that of the injected plastic.
  • Such an insert which seals between the injection nozzle 18 and that of connection to the pot or settling tank under vacuum, allows complete filling of the mold and the counter-mold, in particular when the process is implemented for the on molding of the periphery of an object O, for example a car window or window glass, on the edges of which it is desired to fix a seal i by overmolding.
  • an object O for example a car window or window glass
  • the insert i is both melted and welded to the rest of the plastic material constituting the seal i thus providing a continuous seal of excellent quality.
  • the method according to the invention which can be implemented with a plastisol, but also with any liquid plastic material, in particular of the polyurethane or polyether type, thus allows and subject only to the fact that the prisoner or the part to be overmolded allows use of a high-frequency molding process to obtain the most diverse shapes of parts, in particular when the part to be overmolded is made of wood, glass, laminated composite material or, where appropriate, metal if the "balancing" conditions of the mold at high frequency treatment are calculated satisfactorily.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP19890401162 1988-05-04 1989-04-25 Verfahren und Vorrichtung zum Hochfrequenzgiessen vom flüssigen Kunststoff Withdrawn EP0341127A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805968A FR2630960B1 (fr) 1988-05-04 1988-05-04 Procede et appareil de moulage haute frequence de matiere plastique liquide
FR8805968 1988-05-04

Publications (2)

Publication Number Publication Date
EP0341127A2 true EP0341127A2 (de) 1989-11-08
EP0341127A3 EP0341127A3 (de) 1991-05-08

Family

ID=9365970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890401162 Withdrawn EP0341127A3 (de) 1988-05-04 1989-04-25 Verfahren und Vorrichtung zum Hochfrequenzgiessen vom flüssigen Kunststoff

Country Status (5)

Country Link
US (2) US4954073A (de)
EP (1) EP0341127A3 (de)
JP (1) JPH0284311A (de)
KR (1) KR890017062A (de)
FR (1) FR2630960B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2662969A1 (fr) * 1990-06-08 1991-12-13 Anver Appareil de moulage haute frequence de matiere plastique.

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK294289D0 (da) * 1989-06-15 1989-06-15 Ulrik Flott Andersen Fremgangsmaade til fremstilling af formemner
FR2649034B1 (fr) * 1989-06-28 1991-10-31 Anver Procede et installation de moulage haute frequence de matiere plastique
FR2657308B1 (fr) * 1990-01-04 1994-08-05 Peugeot Procede et dispositif de realisation d'un joint renfermant un insert, a la peripherie d'un vitrage et vitrage obtenu.
US5044926A (en) * 1990-06-25 1991-09-03 Cincinnati Milacron Inc. Anti-backflow valve for injection molding machines
US5366320A (en) * 1991-12-20 1994-11-22 Hanlon Brian G Screed for paving machines
US20090253582A1 (en) * 2006-06-29 2009-10-08 Ge Healthcare Bio-Sciences Ab Chamber apparatus
CN113752480B (zh) * 2021-09-23 2023-04-18 信义汽车部件（芜湖）有限公司 天窗玻璃注塑模具

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2380124A1 (fr) * 1977-02-10 1978-09-08 Suchet Alfort Ste Indle Financ Dispositif pour le moulage sous pression d'objets en matiere plastique
GB2124968B (en) * 1982-08-06 1985-11-13 Mouldmaking Design Centre Limi Removing sprues from mouldings
US4839122A (en) * 1983-09-26 1989-06-13 Libbey-Owens-Ford Co. Reaction injection molding of window gasket
JPS61502179A (ja) * 1984-06-25 1986-10-02 キヤタピラ−　トラクタ−　カンパニイ 一体型ウインドパネルの形成方法
US4792425A (en) * 1985-12-23 1988-12-20 Libbey-Owens-Ford Co. Method of making a windshield and leaf screen assembly
FR2598959B1 (fr) * 1986-05-26 1988-12-02 Anver Procede et dispositif d'injection de pastisol liquide sous faible pression
JPS63297010A (ja) * 1987-05-29 1988-12-05 Hashimoto Forming Co Ltd 車両用ウインドウの製造方法
FR2627721B1 (fr) * 1988-02-29 1991-01-25 Peugeot Procede et dispositif de realisation d'un joint solidaire de la partie peripherique d'un vitrage et vitrage obtenu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2662969A1 (fr) * 1990-06-08 1991-12-13 Anver Appareil de moulage haute frequence de matiere plastique.

Also Published As

Publication number Publication date
JPH0284311A (ja) 1990-03-26
FR2630960A1 (fr) 1989-11-10
EP0341127A3 (de) 1991-05-08
US5069835A (en) 1991-12-03
FR2630960B1 (fr) 1992-03-13
KR890017062A (ko) 1989-12-15
US4954073A (en) 1990-09-04

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